Clock



FIG. 1 is a front perspective view of a clock showing my new design;

FIG. 2 is a front perspective view in opened position thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a rear elevational view thereof; and,

FIG. 8 is a bottom plan view thereof.

The ornamental design for a clock, as shown and described.